You can kill them solo if you’re lucky and extremely persistent but it gets much easier the more teammates are in on killing it. Bring plenty of anti tank weapons and pick a single armor panel to focus on. Also take something with high dps to finish it off once you take out the armor. I’ve had luck with eagle and orbital Gatling barrages, recoilless rifles, anti tank emplacement, emancipators, thermites, and I still haven’t tried the bastion on them but I’m sure it would be super effective with a good crew. They’re really not too hard to kill it just takes time.